Type mismatch and deprecation warning

The following example code has an error:
https://github.com/neo4j-graph-examples/blank-sandbox/blob/main/code/python/example.py#L17-L19

```
Type mismatch for parameter 'limit': expected Integer but was String
```

Also a deprecating warning:

```
DeprecationWarning: read_transaction has been renamed to execute_read
```
